Ranking of Iowa Counties By Population in 2012

Updated on July 26, 2024.

Based on the US Census Vintage data estimates, in 2012, the Population for Iowa was 3.08M. Among all Iowa counties, Polk County had the highest population (444.75K), followed by Linn County (215.54K), and Scott County (168.43K).

The chart below shows the top 10 counties, and the table below shows the ranking of all Iowa counties.

You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.

See this for other years:
Ranking of Iowa Counties By Population in 2012
Polk
Linn
Scott
Johnson
Black Hawk
Woodbury
Dubuque
Pottawattamie
Story
Dallas
Ranking of Iowa Counties By Population in 2012
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Rank County Population
1 Polk County 444753
2 Linn County 215542
3 Scott County 168433
4 Johnson County 137180
5 Black Hawk County 131904
6 Woodbury County 102351
7 Dubuque County 95183
8 Pottawattamie County 92965
9 Story County 92046
10 Dallas County 72248
11 Clinton County 48711
12 Warren County 46906
13 Cerro Gordo County 43704
14 Muscatine County 42922
15 Marshall County 41032
16 Des Moines County 40247
17 Webster County 37335
18 Jasper County 36583
19 Lee County 35549
20 Wapello County 35430
21 Sioux County 34289
22 Marion County 33277
23 Boone County 26138
24 Benton County 25829
25 Plymouth County 24836
26 Bremer County 24499
27 Mahaska County 22407
28 Washington County 21910
29 Winneshiek County 21048
30 Buchanan County 20995
31 Fayette County 20773
32 Carroll County 20653
33 Jones County 20602
34 Buena Vista County 20558
35 Henry County 20003
36 Jackson County 19684
37 Poweshiek County 18734
38 Cedar County 18299
39 Clayton County 17947
40 Delaware County 17568
41 Tama County 17500
42 Hardin County 17360
43 Crawford County 17292
44 Jefferson County 17281
45 Dickinson County 16929
46 Clay County 16540
47 Iowa County 16183
48 Floyd County 16090
49 Page County 15705
50 Madison County 15639
51 Kossuth County 15407
52 Hamilton County 15321
53 Butler County 14972
54 Mills County 14874
55 Harrison County 14474
56 O'Brien County 14154
57 Allamakee County 14150
58 Cass County 13697
59 Wright County 13019
60 Appanoose County 12713
61 Union County 12585
62 Grundy County 12437
63 Chickasaw County 12289
64 Shelby County 12032
65 Cherokee County 11954
66 Lyon County 11761
67 Louisa County 11364
68 Hancock County 11180
69 Guthrie County 10768
70 Mitchell County 10714
71 Winnebago County 10608
72 Montgomery County 10541
73 Franklin County 10509
74 Keokuk County 10427
75 Sac County 10161
76 Emmet County 9949
77 Calhoun County 9912
78 Humboldt County 9724
79 Howard County 9550
80 Clarke County 9339
81 Palo Alto County 9278
82 Greene County 9181
83 Monona County 9090
84 Lucas County 8777
85 Davis County 8705
86 Decatur County 8241
87 Monroe County 8070
88 Worth County 7495
89 Adair County 7466
90 Van Buren County 7449
91 Pocahontas County 7143
92 Fremont County 7140
93 Ida County 7045
94 Wayne County 6329
95 Taylor County 6259
96 Osceola County 6203
97 Audubon County 5861
98 Ringgold County 5025
99 Adams County 3910